Early aggressive drug therapy is usually the avenue pursued in horses diagnosed with Equine Protozoal Myelitis (EPM). Drug therapy can eliminate the protozoal parasite that causes EPM and any adverse side effects of treatment are rare. However, both pyrimethamine and the sulfonamides used to treat EPM inhibit folic acid metabolism. It is suggested in the September 1996 issue of "Journal of Equine Veterinary science", Volume 16, Number 9 to supplement 40mg orally of folic acid per day to help prevent the development of side effects. EPM Supplement supplies Choline and folic acid in available and balanced forms. Adding ABC's Choline to your horses diet is suggested following drug therapy. EPM Supplement contains 4000 IU of Vitamin E, 20mg of Folic Acid and 5500mg of Choline Chloride. EPM Supplement is also available without Folic Acid.